Change author information in Get Info or Finder?

I am a new Mac user (Lion) and am trying to change the author information of a Word document. In Windows this is quite simple: you go to Document properties, click on Details, and make the changes. You can do this with multiple documents at the same time.

Given that the Mac OS is generally more intuitive, I was thinking this would be easier. When I do Get Info in Finder, although it shows me the author of a document (I am referring to a Word document in this case), it does not allow me to change the author...

Am I missing something? I can't imagine this is not possible...Thanks for any help...

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